Powder measuring device with micrometer adjustment



H. W. BROWN March 4, 1952 POWDER MEASURING DEVICE WITH MICROMETER ADJUSTMENT Filed Jan. 15, 1950 III Patented Mar. 4, 1952 PQWDER-MEA'SURING DEVICE WITH MICROMETER ADJUSTMENT Horace Wt Brown, West Newbury Mass.

Application J annary 13, 1950, Serial No.13'8,430

Claims. (Cl. '73--429) I 1 This invention relates to a measuring .devicecof extremely simpleconstruction for use in accuratel-y measuring powder charges 'for firearm :cartri'dges and which can be quickly and easily setfor accuratel-y -measuring .any desired charge :of any i particularltype-of powder and by which a desired "setting =can be-quickly reproduced or duplicated.

More par'ti'cularly, it is an aim of the presentin- =vention to "provide a device including 'a movable "plunger having a linear scale capable :of :being 'accurately adjusted to one-thousandth of an Einch for measuring powder readily to one-tenth zdf a .;grain and which is intended to be :utilized with n suitable chart for different types of-powder due 'to the fact that modern powders -are loaded "by weight and the-number of grains or tenths :of grains of a given weightvar-y for different powders so that a ehar-t is required-to convert the'weight of any *specificpowder to the linear measure I as- -=soialted withtherpowder measuring device.

More particularly it is-an aim of the present invention to'provide a device which will eliminate the s'low 'and 'tedious process of weighingcharges and by which a -powder measuring chamberof the device may be varied in size accurately to accommodate any "particular powder charge 'of 'any'type oflpowderandthe desired setting readily reduced or-duplicated when required.

'Various other objects and advantages of the :invention'will hereinafter become more fully ap- *parent from the following description 'of the rdrawing; illustrating presently preferred embodii'ments thereof, and wherein:

1 Figure 1 is a plan view of one embodiment "of -the -measuring device;

j 'F'igure'fflis'a'longitudinal central sectional view 'thereof;

' Figure 3 .is an .end elevational view looking ffrom leftsto righttofFigure 1;

Figure *4 is a :cross sectional view taken sub- :stantially along aiplane as indicated by the-line 4-4 of Figurel';

Figure 5 is an end elevational view looking from rightto left of Figure 1; Figured isa plan view similar to Figure 1 but.of -'-a.-slight1y different form of the device: and 1 Figure '7:isia cross sectional view thereof taken zsubstantially: along a-plane as indicated by the line z1--'|.ofiFigure 6.

Referring more specifically to the, drawing and indted generallyi-t a andi includes anelongatedbody :meniber, fidesignated' generally: 9 one .end. div-which is preferably externally restricted asseens'at T0. The body :member Shas :a bore .:of circular cross section and of uniform diameterias seen at H which 'extends fromtits restricted end'toia'd'jacent its'opposite'end andsaidilast mentioned end forms an end 'wall 12 having a restricted opening l3 which registersiwith andiisdisposed axially of the bore H. The enlarged :body portion isicut away from the :end wall lzto aipointadjacentto the restrictedjportion 10 *to provide an opening l4 having 'a'lrestricted end l-5,ilocated .remote to the wall I2 .and including a transverse portion l6 constituting a sight line, as will hereinafter become apparent. nn elongated plunger 11 of circular external cross section Sis reciprocally disposed in the b'ore fll and 'issized for relatively close'fitting engagement therewith.

"The plunger l-I has an elongated recessor bore l8 extending-fromsnear one-end-thereof and which opens outwardly- 0f 'the-end of thep'lunger which is located adja'centthe'endwall i2. Therecess or bore l8 is enlarge'd and :internally threaded as seenat [9 'at its open 'end to'receive an externally threaded restricted-end of asleeve 2| which is provided u'r'ith a threaded bore 2 2- of'a' diameter slightly'less than the diameter-of thebore or recess l8. 'The'sleeve 2I"projects'a shortdistance beyond the inner end 0f the plunger 5 H and 'to- 'wardtheend'wall I2. I

A feedscrew 23 threadedly engagesthe threaded bore 22 and-extends from the'sleeve 2! through the opening 13. 'Aknob, designated generally 124 is detachably secured 'on the exposed end of thefeed'screw' 2'31preferab-ly"by a setscrew 25 and by 'a'nuti26 which engagesxsaid feed screw end. iThe'knOb'Zd is disposed outwardly of the'end wall 12 and a'collar 'oristopZ'l is .detachablysecured itotheifeedoscrewfl by asetscrew 28 on theinner sideiof. the endwall'l2.

L'Ihelknob 241has an enlarged peripheral portion :29 on which is t suitably inscribed twentyfive graduation lines 30 whichare equally spaced therearound .and .adjacentthereto, the knob .24 has .a frusto-iconical .por'tion 3| containing the indicia 32, as best seen in IiFigure v5, designating each fifth graduationidfl. IheJIOngitudinaI portioniof the plungerrl Twhich is visiblethrough the cutout toryopening 14 is provided "with longitudinally spaced --graduations 33 and the -indicia 34 comprising consecutive numerals beginning "with zero and with a .numeraLapplied .to each ifourthigraduation.

,Thezplungerdl is'providedwith-a longitudinally :iextending groove 35 and :the body memberifiihas *a :radial i'threa'ded ibore 136 which-opens into the 3 bore H for receiving a setscrew 31, the inner end of which is adapted to be disposed to slidably engage 1n the groove 35 to permit the plunger I? to reciprocate in the bore l I but to prevent it from rotating therein.

The portion of the bore ll between its p end and the adjacent end of the plunger I! constitutes the powder measuring chamber 38 of the measuring device 8, the size of which chamber may be varied by turning the knob 23 to move the plunger I1 toward or away from the open end of the bore II for reducing or increasing, respectively, the size of the chamber 38. By turning the knob 24 clockwise as seen in Figure 5 the plunger "is drawn toward the end wall 22 to increase the size of the chamber 38 and by turning the knob counterclockwise, the plunger is advanced toward the open end of the bore H for restricting the chamber 38. The size of the chamber 33 is read in terms of inches and fractions thereof by means of the graduations 33 3B and the indicia 34 and 32,.respective1y, associated therewith. The spacing between the adjacent graduations 33 each represent .025 inch and the spacing between the numbered graduations 33, designated by the numerals 34 represent .100 inch the zeros being omitted from the numerals 34. One revolution of the knob 24 and feed screw 23 moves the plunger .025 inch or the distance between two adjacent graduations 33 so that the twenty-five graduations 36 on the periphery 29 each represent .001 inch. The transverse edge I6 is employed with the graduations 33 as a marking or sight line and it will be seen that the plunger I1 is set in Figure 1 to provide a chamber 38 having a length of .600" since the zerograduation 3|] is registering with the zero sight line 39 of the wall 20. Accordingly, with a chart, not shown, converting diiferent types of firearm powders from weights and grains to a linear measure, the device 8 may be readily set for measuring a charge of any particular powder and is capable of being adjusted for measurin powder charges to more accurately than onetenth of a grain. Likewise, after the device 8 has been set if it is desired to measure a number of powder charges the setscrew 31 may be tightened to additionally function for locking the device at a predetermined setting and it willbe readily apparent that any prior setting may be readily duplicated quickly and easily, thus providing a powder measuring device eliminating the use of a scale and the slow and tedious process of weighing powder charges and which will greatly facilitate the accurate measuring of powder charges,

Figures 6 and '7 illustrate another form of the powder measuring device designated generally 40 and which is identical with the powder measuring device 8 except that the cutout or opening 14 is omitted and in lieu thereof the body 9a. is provided with a relatively small semi-circular opening Ma, the wall or edge llia'of which is disposed transversely of the longitudinal axis of the body 9 and functions in the same manner and for the same purpose as the edge IS. The semi-circular opening Ma is closed by a transparent pane or cover 4| which may be suitably anchored at its ends and edges in the body 9a and through which the graduations 33a and indicia 34a are clearly visible. Accordingly, the measuring device 40. is completely enclosed except for the powder measuring chamber, not shown, as a result the feed screw and other parts located within the bore of the bodya'r'e' completely-protected from dirt and other foreign 'n'iatter'. -As the op eration'and use of the measuring device 40' 1s 4 identical with that of the measuring device 8, a further description thereof is considered unnecessary.

Various other modifications and changes are likewise contemplated and may obviously be resorted to, without departing from the spirit or scope of the invention as hereinafter defined by the appended claims.

I claim as my invention:

1. A powder charge measuring device comprising an elongated body member having a bore extending longitudinally from adjacent one end thereof and opening outwardly of the opposite end, said body member having an end wall at the first mentioned end of the bore provided with a restricted opening registering with said bore, a plunger reciprocally disposed in said bore, means for non-rotatably retaining the plunger relatively to the bore, feed screw means extending loosely through the end wall opening and threadedly connected to said plunger for reciprocating the plunger in the bore, said feed screw means including a thumb knob disposed beyond said end wall of the body member for manuallyrevolving the feed screw means, a portion of the bore, d isposed between the plunger and its openend, defining a powder charge measuring chamber, said plunger having longitudinally spaced graduations and indicia thereon constituting a linear measure, said thumb knob having circumferentially spaced graduations and indicia constituting a Vernier scale for use with the linear measure of the plunger, and said body member having an opening therein through which the linear measure of the plunger is visible for accurately adjusting the plunger for accurately varying the size of the powder charge measuring chamber.

2. A powder charge measuring device as in claim 1, and a transparent pane for closing said last mentioned opening forming a window through which a portion of the plunger is visible andcombining with the body to completely enclose the parts contained within said body between its end wall and the powder measuringchamber.

3. A powder charge measuring device asin claim 1, said means for non-rotatably mounting the plunger in the bore comprising a set-screw threaded radially into said body, said plunger having a longitudinally extending groove for receiving a portion of the set-screw for non-rotatably retaining the plunger in the bore, said setscrew being manually adjustable for. detachably clamping the plunger to the body for maintaining the plunger in a preset position. 7

4. A powder charge measuring device as in claim 1, said plunger having a longitudinally ex: tending recess opening outwardly of an end thereof and toward said end wall, said feed screw means including a feed screw loosely receivable in the plunger recess, an internally threaded sleeve detachably connected to the end of the plunger located adjacent said end wall and through which said feed screw threadedly extends.

5. A measuring device comprising an elongated body member having a bore extending'longitudinally from adjacent one end thereof and opening outwardly of its opposite end, said body member having an end wall at the first mentioned end thereof provided with a restricted opening registering with the bore, a plunger slidably' 'disp'osed in the bore, means non-rotatablyretaining the plunger relatively to the bore, manually actuated feed screw means extending looselythrough the restricted'opening and rotatably and non-slidably disposed in said end wall, said feed screw means 5 being threadedly connected to the plunger for reciprocating the plunger in the bore when the feed screw means is revolved, and the portion of the bore, disposed between its open end and said plunger, defining a variable measuring chamber. 5

HORACE W. BROWN.

REFERENCES CITED The following references are of record in the file of this patent:

6 UNITED STATES PATENTS Number Name Date 1433,075 Gottlieb Oct. 24, 1922 2,521,343 Chadwick Sept. 5, 1950 FOREIGN PATENTS Number Country Date 638,349 Germany Nov. 13, 1936 

